Foot-controlled hammer



April. 21, 1931. w. M. DRENNoN FOOT CONTROLLED HAMMER Filed April 18. 1928 :E ID.

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Patented pr. 2l, 17931 i rUNITED. STATES PATENT OFFICE WILLIAM I. DRENNON, OF ANAHEIM, CALIFORNIA, ASSIGNOR OF ONE-HAL]I EDWARD BENNER, FULLERTON, CALIFORNIA,v ONE-FOURTH T WIM.Y J'. M. HEINZ, AND ONE-FOURTH T0 E. F. GANAHL, BOTH OF ANAHEIM, CALIFORNIA FOOT-CONTROLLED HAMMER Application led April 18, 1928. Serial No. 270,959.

i 'l This invention relates to devices used for striking blows in a rapid successive manner. One of the'objects of this invention is to provide a simple device in which a hammer is actuated b means of a rotating shaft. f AAnother o ject is to provide a loosely suspended hammer-headagainst which material may be held from ybelow and against which a hammer bolt may strike from above. Other objects will appear from the following description and appended claims as well as from the accompanying drawing, in which l1Fig. 1 is a side elevation of a simple machine actuated by an electric motor in a framey structure and controllable by a footpedal in accordance with this invention.

Fig. 2 is a fragmentary detail front elevation of the connection between the rotating shaft and the hammer bolt.

Fig. 3 is a fragmentary detail vertical midsectional view of the hammer mechanism. l Fig. 4 is a fra entary detail vertical midsectioxial view oltxhe anvil mechanism.

Asillustrated in the drawing, the frame 5 is designed to support an electric motor 6 in its upper structure. A flexible coupling 7 of any well-known type is inserted between the electric motor and the main shaft 8. At the free end Vof the shaft 8 a disk 9 y.carries the crank-pin 10. A connecting rod 11 connects the pin 10 of the shaft Swith the hammer bolt 12.l f

The head 13 on the upper arm 14 of the frame 5 carries the hammer mechanism which is illustrated more clearly in'detail in Fig. 3. A sleeve 15 is inserted from the top until the shoulder 16 abuts against the upper surface 17 ofthe head 14. vThe sleeve is threaded about its middle'as indicated at 18 to receive the threaded end 19 of another sleeve 20. The sleeve 20 is disposed to abut against the under side 21 ofthe arm-head 13. 1 By screwing the sleeve 20 securely over the` sleeve 15 until the sleeve 15 is :firmly engaged within the head 13, the sleeve ends 22 and 23 are disposed to project below the armhead 13. These sleeve ends 22 and 23 are spaced from one another as indicated at 24, whereby the sleeve ends 22 and 23 form the guide fory the sleeve portion 25 of the hammer-head 26. The sleeve portion 25 is provided with a slot 27 through which a set screw 28 is inserted to limit the up and down movements of the hammer head 26.

The hammer bolt 12 is shiftable within the tube 15 with its lower end 29 abutting against the inside of the hammer-head 26.

By holding any material against the underside of the hammer-head 26, the hammer bolt 12 comes into a position to strike upon the inside of the hammer-head 26, vand the strength of a stroke increases the harder the material is pressed against the underside of the hammer-head 26.

,F or yieldingly Vholding material under various pressures againstthe underside of the hammer-head 26 a suitable mechanism is embodied in the lower portion of the frame structure.

The anvil mechanism is controllable by a. foot-pedal 30 pivotally connected to the frame structure as indicated at 31. A connecting rod 32 connects the foot-pedal with the lever 33. A free end 34 of the lever serves to support the anvil bolt 35. The anvil bolt is madev in two sections telescopically disposed to one another with a spring 36 disposed between the two anvil bolt sections. The upper bolt section 37 is provided with a recess 38 in its upper end, as illustrated more clearly in detail in Fig. 4, to receive a pin end 39 of the anvil 40.

The anvil 40 is hereby made removable and exchangeable. In Fig. 4, for instance, the anvil is shown with a concaved face 41 suitable for certain purposes while other faces may be desirable for other purposes. Various anvil-heads are therefore made applicable by this removable and exchangeable feature. Y Y

A spring 42 connects the free end 84 of the lever 33 with the foot-pedal 30 whereby the foot-pedal is held in itsuppermost inoperative position and the lever 33 in its lowermost inoperative position, the anvil being dis-V posed in its `lower resting position on the lower arm 48 of the frame structure.

l/Vhen the motor .6 is operated, the hammer bolt 12 'is .rapidly moved np .and `down.; however, as long as no pressure is applied to the hammer 26, no blow, hammering or striking is produced. A material is placed on the anviljfiO whichremains spaced and untouched below the hammer nntil the foot-pedal Vis actuated.

As soon as the foot-pedal isractuatedr'or" pressed downwardly, the material Vis gradually brought up against the hammer 26 until the hammeris also lifted with theupward moving material.' y' Y 2 Assoon as the Vmaterial Visflifted high enough that kthe hammer-head is also lifted,

the hann'ner bolt 12 is in a position to strike upon the hammenhead26 against the spring Y 36 the anvil mechanism.

The spring 3.6 should therefore be .snf{i ciently-strong and of suiicient length to al;

'low the use of theV fnll lstrength obtainable V from the hammer-head through the striking ofthe hammer bolt 1,2 withinthe limits of the slot 27 in the hammer sleeve 25. By increasing Ithe pressure upon the'footpedalto result in a higher lifting .of the material. placed on the anvil 40v against the v hammer-head 26,- the blows or the strength ofthe hammering' is also increasing;V Lighter blows may be obtained by releasing` the foot-pedal accordinglyV so asxto reduce rthe'pressnre1 against the hammer-head Y 'and bygholdingthe material under lighter y head 26'. Y

pressure against the hammer-head so that the hammer bolt'mayhave lesszinfluenceV as it strikes against the inside of the hammer- 1 V.As illustrated'in 2, thelongitudinal axis of the hammer bolt 12 is disposedQnot,

eXactly'in line with the vtransversely disposed axis of the main driving shaft 8, vbut rather eccentricV or sidewise in order' that the heaviest stroke of the hammer-head will be accomc plshedwhen the crank pin 10 isf` directlyv sidewise from the center or axis of the shaft ,8. y This means that when the anvil is forcedy against the hammer-head, the hammer bolt 12 will hit the hammer-head when the crank pin is inthis ysidewise"position andwhen the connectingA rod is approximately in astraight 'continuous line with the axis of the hammer bolt, so that the least binding-may be eX- Vpected onv the sides of the hammer bolt while this is shiftedor pushedinto the Vsleeve 15.

" Having thus described my invention,- I claimt 1. In a hammer, a frame structure embodyingV an upper and a lower arm, a shaft with its anisV disposed in aphorizonta-l position mounted above the upper arm of the frame, a hammer-head shiftably suspended in the upper arm, a hammer bolt operatively connected with th-e shaft shiftable within and adapted to strike against the hammer-head, and an anvil disposed in the lower arm of the frame yieldin-gly shiftable towards Y the hammerhead Y Y 2. rIn a hammer, a frame structure embodying an upper and a lower arm, a shaft withits laxis disposed ina horizontal position mounted above the upperj'arm of the frame, aham mer-head yieldingly' mounted lin the 'upper Carin, .a hammer bolt operatively connected with the shaft shiftable within and adapted to strike against the hammer-head, and an anvil disposed in the lower Varm of the frame yieldingly .shiftable Itowards' the Ahammerhead, the longitudinal axis' of the hammerbolt being disposed sidewise from the transversely disposed axis of the shaft as and for the `pm pose described. Y l l 3. ln a hammer, fram-e structure.embody ing anv upper and a lower arm, ashaft with its ,axis disposed Vin. a horizontal position mounted Vabove the upper armV of the frame,

ahanimer-head yieldingly mounted in the Vvend terminating` approximately near ythe free end of and spaced from the rst-named sleevc,-a hammer-head having ajsleevepor'.-

tion to siidably shift between the two spaced ends of the previously Vnamed twosleeves so that the closed'end of -thehammerfhead ex- Vtends f transversely over' theu ends VYof the previously named sleeves, and ahammerbolt shiftably disposed within the rfirst-named y:sleeve adapted to' strike with itsfregf end against the inside; of the hammer-head', `Y

5. A vhammer :mechanism comprising la sleeve with an annular shoulder yat one end and a threaded portionintermediate its ,two ends, a second sleeve having a threaded portion in one end to yengage with the threaded portion of the first-named sleevewith its free ,end terminating approximately near` the free end of and -spaced from the first-named sleeve, a hammer-head having asleeve pori139 tion to slidably shift between the two s aced ends of the previously named two s eeves so that the closed end of the hammer-head extends transversely over the ends of the previousl named sleeves, a. hammer bolt shiftably disposed within the first-named sleeve adapted to strike with its free end against the inside of the hammer-head, and a stop for limiting the shifting movements.

In testimony that I cla-im the foregoing as my invention I have signed m name.

WILLIAM M. DR NNON. 

